Hose fitting



March l5, 1932.

B. DICK i HOSE FITTING Filed Oct. 25, 1928 Invntor @Lc/L Atty. j

Patented Mar. 15, 1932v "1Q- UNITED STATES.

- PATENT; OFFICE BURNS mex, or sr. Louis, mssounr', AssIeNon 'ro WAGNER. nnncrnro conronArIoN,

or sgr. LoUIs, mssour, A conronArIoN `or nELAwAnE Appunmqnmea october as, 192s. serial 110,814,915.

Myinvention relates to a hose litting par'- ticularly designed for use as-a coupling device in the lines of Huid operated braking apparatus. DTheobject is' to produce a fitting 5 which may be economically made and pplied, and whichy will forma connection w1 the hose which will be fluid tight under high other service conditions of braking apparatus L for vehicles.

My improved fitting is particularlyvtlseful lin connection withhose of small bore and small diameter and in which no internal spring or other resilient member is employed l to distribute bending stresses in the hose.A

In the accompanying drawings Figure 1 is a `crosssectional view illustrating an embodiment of my invention; Figure 2 is a cross sectional view illustrating the sleeveportion zo of the fitting; Figure 3 is a cross sectional view of the'nipple portion of the fitting; and Figure 4 is an end elevational view of the assembled fitting. l l

The hoseI 1 is composedv of layers of rubber 2 and textile material. 3, and is of relatively small bore with the result that it may be of small-diameter and yet withstand the liquid pressures applied to it in the operation of the'braking' apparatus.'

AThe sleeve comprises a body- .portiori 4' and a rearward extension, the latter being of ,hexagonal shape exteriorly. The end of the hose is somewhat reduced in diameter -by grinding,and theinterior of the sleeve is provided with a'plurality oi alternate grooves 8 and ridges "9, as indicated in the drawings. The diameter of the hose end which is tov be inserted inthe sleeve is greater than the' diameter of the Iridgesin the sleeve and the c hose*- is forced into the sleeve Iunder pressure, thus causin the rubbery ofthe outer layer to be exuded into the grooves.l The diameterfofthe bore of the rearward extension 5 of the` sleeve is approximately the same or greater `than the diameter'of the portion of the hose which enters it.` v 1, Afterthe hose has been forcedV into 'the .sleeve the nipple, shown .in Figure' 3and which coniprises'a tubular body having a circular flange 6 at one ed, .is inserted into the 6 of the nipple,

bore of the hose4 and the body of the nipple is then expanded to the shape shown inFigure Il, This expanding operation develops a ve'ry strong. pressure between the outer surface of the hose and the sleeve, and between the nip- 1e and the inner surface of the hose, and

thus a liquid tight and mechanically strong titting and the hose.

I have provided convenlent means for re pressure and will satisfactorily meet the j0nt S frmed between the parts 0f the taining the nipple in the hose, and in proper relation to the sleeve, which comprises the circular liange 7 at the forwardend of the sleeve andthe taperedperiphery of the flange as shownlin Figures l and 3. When the nipplehas beenv inserted into the hose the flange 7 is rolleddown on the tapered y periphery ot the nipple, thereby permanently holding the nipple in place. The function of the rearward extension 5 of the sleeve is to prevent cracking of the hose under thembending strain to which it is subjected in service. Without this extension the hose will crack closely adjacent'to the point whereit is in firm contact with the sleeve. By providing, the extensionvs, which loosely embracesv the hose,'-that is, which either does not bear upon it in the normal position of Gthe parts, or has only a light pressure contact with it, and has a larger internal \diameter than the portion of the sleeve which is in pressure contact with the hose, I sodisributel the bending stresses as to prevent cracking of the hose. This distribution of bending stresses results from the fact that the .hose ,may bend over. the rear edges of the opening through the extension, which edges are preferably rounded, as'shown, and due to vthe loose vfit and the distance from the rear l .of the extension to the joint where the hose visfirmly held, the rubber may and will stretch hose drops through a small space from a high pressure to no pressure.

Having fully described my invention, what I claim as new and desire to secure by Let- 5 ters Patent of the United States is:

In combination with a hose, an exteriorly threaded rigid connector embracing the peripheral portion only7 of the end of the hose, and an expanded tubular clamping member 10 in the bore of the hose and maintaining it in pressure engagement with the connector, said clamping member being provided' with a circular head portion of greater diameter than the hose receiving bore of the connector and having a tapered. periphery, and said connector being provided with a shoulder 'portion forming a stop for the head of the clampp ing member and with a circular extension bent into engagement with the tapered pe- 20, ri hery of the head of the clamping member.

n testimony. whereof, I hereunto aiiix my signature,.this 19th day of October, 1928.

' BURNS DICK. 

